Reply to "roller v. flat tappet"

Roller cams do add weight to the valve train. That weight has to be accelerated and decelerated the same as a valve train of lighter weight. That is why they need the heavier springs. The heavier springs increase stress on the valves and the whole valve system increasing the load on the timing gear and increasing the amount of vibration thedistributer gear sees also. So it isn't as simple as what they lay out here. I agree you get more performance, but I believe you trade less durability to get it.